The making and care of the garden and the nursing of the young ants are done by the smallest workers. Slightly larger workers are responsible for cutting leaves to
make them suitable for use in the gardens and for cleaning the nest. ___35___ third
group of still larger ants do the construction work and collect fresh leaves from outside the nest. The ___36___ (large) are the soldier ants, responsible for defending the nest.
___ 37___ (find) out how good the various size-groups are at different tasks,
the scientist measured the amount of work done by the ants against the amount of
energy they used. He examined first the gathering and carrying of leaves. He selected one of the size groups, and then measured ___38___ efficiently these ants could find leaves and run back to the nest. Then_he repeated the experiment for each of the other size groups. ___39___ this way he could see whether any group could do the job more efficiently than the group normally undertaking it.
参考答案Key:
25. But 26. work 27. when 28. where 29. If 30. later
31. examined 32. cut 33. requiring 34. be divided 35. A 36. largest 37. To find 38. how 39. In
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